Electrocardiogram of Bundle-Branch Block in the Bovine Heart

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Abstract
The electrocardiographic consequences of blocking the right or left bundle branch have been recorded in experiments on calves. Block of either bundle was attended by lengthening of QRS interval by approximately 0.02 second and by changes in form of QRS paralleling closely those occurring in canine hearts under comparable circumstances. Significance of this parallelism to concepts of morphology and function of ventricular conduction systems in bovine and canine hearts is considered. Data reported here render problematic the concept of functional continuity of right and left divisions of the specialized ventricular conduction tissue in the bovine heart.